Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed90f27e1aa3d2f3…

MALICIOUS

PDF

70.3 KB Created: 2021-01-25 12:12:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 599f7b4e95c251fdf6a11785ee45a88f SHA-1: 7929b0c1e0341414eeeef6c0efa83ff0fbe174f3 SHA-256: ed90f27e1aa3d2f3e6b91b6f7ba2daa90d21e05624d308d516663c7eada8fdbe
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/123?utm_term=bob+the+builder+roley%2527s+tortoise PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4422163/normal_5fce3533648c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fe7d2c693659.pdfIn PDF document text
    • http://vamekujo.66ghz.com/bazaar_kannada_movie_720p.pdfIn PDF document text
    • https://malojedatev.weebly.com/uploads/1/3/0/8/130813840/dusebuxo_semefokuganox.pdfIn PDF document text
    • https://rimuzomidaz.weebly.com/uploads/1/3/4/3/134353295/fakaxirawikuv-bivifugegatula-zuginiwozorotut-wokoravi.pdfIn PDF document text
    • https://rekepepijo.weebly.com/uploads/1/3/4/0/134018016/tinenar_talaxupor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375889/normal_5fd095ddb53d0.pdfIn PDF document text
    • https://fabirakarag.weebly.com/uploads/1/3/2/7/132710689/gunir-rimosifiduk.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/renij.pdfIn PDF document text
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/3671412.pdfIn PDF document text
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/newimogo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vilaxetewutino.epizy.com/hindu_god_name_list.pdfIn PDF document text
    • http://nurupejizijij.rf.gd/23093923591.pdfIn PDF document text
    • http://teruwizirazi.rf.gd/relieving_letter_in_ms_word_format.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/amelogenesis_imperfecta_case_report.pdfIn PDF document text
    • http://zedotedifajo.epizy.com/linkedin_ads_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/android_backup_contacts_to_sd_card.pdfIn PDF document text
    • http://rulakilelakeze.epizy.com/facts_about_mercury_worksheet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 2888 bytes
SHA-256: c82bebd4b493aaaf84143f05ff6967641e6933e4069ecd51460b008fb5b9cf8a
font_01_sfnt_off0000d3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 5028 bytes
SHA-256: 224940f5d08f07a9948600182391592cf43591f562e3a8db4ab07a985258264a
font_02_sfnt_off0000e517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 12424 bytes
SHA-256: 95af6e4914a23eafb768665f1b6e042a292e0e11577f3ebcf71f1610b3f9851a

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